US4925706A - Process for the chemical metallizing of textile material - Google Patents

Process for the chemical metallizing of textile material Download PDF

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Publication number
US4925706A
US4925706A US07/257,120 US25712088A US4925706A US 4925706 A US4925706 A US 4925706A US 25712088 A US25712088 A US 25712088A US 4925706 A US4925706 A US 4925706A
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Prior art keywords
textile material
coating
activating solution
solution
impregnating
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US07/257,120
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Holger Kistrup
Claus von Benda
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Deutsche Automobil GmbH
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Deutsche Automobil GmbH
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/83—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with metals; with metal-generating compounds, e.g. metal carbonyls; Reduction of metal compounds on textiles
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
    • C23C18/18—Pretreatment of the material to be coated
    • C23C18/20—Pretreatment of the material to be coated of organic surfaces, e.g. resins
    • C23C18/28—Sensitising or activating

Definitions

  • the invention relates to a process for the chemical stabilizing of textile material, particularly by using an activating solution and subsequently coating the material with metal.
  • Known metallization of textile material includes the following procedures.
  • the material to be metallized is treated for some seconds to a few minutes with an activating solution preferably at room temperature.
  • the activating solution contains palladium in ionic, colloidal or finely dispersed form and tin (II) salts which should be present in excess.
  • the pH value of the solution should always be smaller than 1.
  • the material thus activated is then rinsed with water until the wash water gives a neutral reaction. This may require a rinse operation in several stages. Thereafter, the rinsed material is treated in an acid or alkaline medium, for example 5% strength sulfuric acid or 5% strength sodium hydroxide solution. This treatment is referred to as accelerating or hydrolysis. It serves to free the surface of the catalyst particles (palladium or palladium/tin particles) adhering to the fiber from excess tin gel hydrate (stannic acid). This is followed by a further rinse to remove excess treatment medium.
  • an acid or alkaline medium for example 5% strength sulfuric acid or 5% strength sodium hydroxide solution. This treatment is referred to as accelerating or hydrolysis. It serves to free the surface of the catalyst particles (palladium or palladium/tin particles) adhering to the fiber from excess tin gel hydrate (stannic acid). This is followed by a further rinse to remove excess treatment medium.
  • the textile material is subjected to a treatment with an alkaline metal salt bath, during which the prescription of the metal onto the textile material takes place.
  • a treatment with an alkaline metal salt bath during which the prescription of the metal onto the textile material takes place.
  • An object of the invention is to provide a process for the chemical metallizing of textile material which is substantially simpler, and in which the amount of the wastewater to be treated is substantially reduced.
  • this removal of excess activating solution can be effected, for example, by centrifuging, squeezing off with rolls, or blowing out with air and the like. After this mechanical removal of excess activating liquor, the fiber is still wet with the activating solution. Without any further treatment, the textile material is then brought into contact with the metallizing solution and becomes coated with the desired metal.
  • suitable textile materials are filaments, fibers and textile structures, in particular, fleece material and needled felt.
  • fleece material or needled felt which has a fiber linear density of 1.3-3.7 dtex, a porosity of 50% to 90%, and a thickness of 1-10 mm.
  • the preferred fiber material is polyethylene or polypropylene, but in principle it is also possible to use other textile material made of filaments or fibers from fiber-forming synthetic polymers composed of acrylonitrile polymers, vinyl, polyester, polymodacrylic, polyvinyl halides or other polyalkalenes.
  • the metallizing solutions have likewise been known for a long time.
  • the metallizing solutions or baths are preferably baths of nickel salts, cobalt salts or mixtures thereof, copper salts, gold salts or other salts which can be deposited from alkaline baths
  • very particular preference is given to ammoniacal nickel baths or NaOH-based copper baths. It is, of course, also possible to use mixtures of ammonia and sodium hydroxide solution to maintain the desired pH value.
  • the textile material metallized by the process described can be used, if desired after increasing the thickness of the metal coat by electroplating, for panel heaters, electromagnetic fields against radio waves, as electrode supports and the like.
  • the needled felt web was directly dipped into a chemical nickeling solution.
  • the solution contained 24 g/l of nickel (II) chloride and 50 g/l of sodium hypophosphite. Sufficient ammonia was added to this solution to bring it to pH 8-10 at 30°. Nickeling was complete after about 30 minutes.
  • the textile material was freed from spent nickeling solution by squeezing off and by washing with water and was then dried.
  • a fleece material web of polypropylene having a nominal thickness of 4 mm, a width of 400 mm and a length of 25 m, and also a porosity of 95% was activated with a commercially available Pd/Sn-based activating solution. After 20 minutes, excess activating solution was centrifuged off the fleece material web.
  • the polypropylene web was then coppered at pH 12.5 in a chemical coppering bath containing 50 g of copper sulfate/l, 50 g of sodium potassium tartrate/l, 20 g of sodium hydroxide/l and 100 g of formaldehyde/l. After removal of the spent coppering solution, inspection under the microscope showed no fiber on which copper had not been deposited. Also, in this case, the omission of the washing and rising solutions between activation and chemical metallization had no adverse effects whatsoever on the metallization.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Chemically Coating (AREA)

Abstract

A process is described for the chemical metallization of textile fibers or textile fibrous structures by treating the textile fibrous structure with an activating solution, removing excess activating agent, and without any further intermediate treatment, bringing the fiber into contact with a chemical metallizing solution.

Description

This is a continuation of application Ser. No. 078,762, filed July 28, 1987, and now abandoned.
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a process for the chemical stabilizing of textile material, particularly by using an activating solution and subsequently coating the material with metal.
Known metallization of textile material includes the following procedures.
The material to be metallized is treated for some seconds to a few minutes with an activating solution preferably at room temperature. The activating solution contains palladium in ionic, colloidal or finely dispersed form and tin (II) salts which should be present in excess. The pH value of the solution should always be smaller than 1.
The material thus activated is then rinsed with water until the wash water gives a neutral reaction. This may require a rinse operation in several stages. Thereafter, the rinsed material is treated in an acid or alkaline medium, for example 5% strength sulfuric acid or 5% strength sodium hydroxide solution. This treatment is referred to as accelerating or hydrolysis. It serves to free the surface of the catalyst particles (palladium or palladium/tin particles) adhering to the fiber from excess tin gel hydrate (stannic acid). This is followed by a further rinse to remove excess treatment medium.
After this last rinse, the textile material is subjected to a treatment with an alkaline metal salt bath, during which the prescription of the metal onto the textile material takes place. Such a process has been described in detail, for example, in German Published Unexamined Patent Application No. 2,743,768.
The various treatment and wash operations give rise to large amounts of wastewater which needs to be treated not only to recover valuable substances, but in particular, to remove heavy metals present therein, to protect the environment. These cleaning operations are relatively costly, in particular because the wastewaters need to be very pure.
An object of the invention is to provide a process for the chemical metallizing of textile material which is substantially simpler, and in which the amount of the wastewater to be treated is substantially reduced.
These objects are achieved by providing a process for the chemical metallizing of textile material by activating the textile material by means of an activating solution which contains tin (II) ions and palladium in ionic, colloidal or finely dispersed form, and subsequently coating it with metal in a currentless fashion from an alkaline metallizing solution. First, the textile material is impregnated with an activating solution. Excess activating solution is then removed from the pores of the textile material mechanically. The textile material is then brought directly into contact with the metallizing solution without further intermediate treatments, and the textile material is coated with metal.
It was found, surprisingly, that the wash and rinse operations and the accelerating between the impregnating of the fiber surface with the activating solution and the treatment with the chemical metallizing solution are dispensable. It is assumed that the processes of the hydrolysis or accelerating steps can still take place even if the fiber surface wetted with the activating solution is already in the metallizing solution without thereby impairing the metallization. The only step required between the activation and the chemical metallization of the textile material in the process is the removal of excess activating solution from the pores of the textile material in a conventional mechanical manner.
According to advantageous features of certain preferred embodiments of the invention, this removal of excess activating solution can be effected, for example, by centrifuging, squeezing off with rolls, or blowing out with air and the like. After this mechanical removal of excess activating liquor, the fiber is still wet with the activating solution. Without any further treatment, the textile material is then brought into contact with the metallizing solution and becomes coated with the desired metal.
According to advantageous features of certain preferred embodiments of the invention, suitable textile materials are filaments, fibers and textile structures, in particular, fleece material and needled felt. In certain preferred embodiments of the invention, particular preference is given to a fleece material or needled felt which has a fiber linear density of 1.3-3.7 dtex, a porosity of 50% to 90%, and a thickness of 1-10 mm. In certain preferred embodiments of the invention, the preferred fiber material is polyethylene or polypropylene, but in principle it is also possible to use other textile material made of filaments or fibers from fiber-forming synthetic polymers composed of acrylonitrile polymers, vinyl, polyester, polymodacrylic, polyvinyl halides or other polyalkalenes.
The preparation and composition of the activating solutions is well known to those skilled in the art and is described, for example, in German Published Unexamined Patent Application No. 1,197,720.
The metallizing solutions have likewise been known for a long time. According to certain preferred embodiments of the invention, the metallizing solutions or baths are preferably baths of nickel salts, cobalt salts or mixtures thereof, copper salts, gold salts or other salts which can be deposited from alkaline baths In certain preferred embodiments, very particular preference is given to ammoniacal nickel baths or NaOH-based copper baths. It is, of course, also possible to use mixtures of ammonia and sodium hydroxide solution to maintain the desired pH value.
In this process, the numerous hitherto customary process steps between the activation and the chemical metallization can be dispensed with, resulting in appreciable cost savings in the disposal of wash liquors. The quality of the chemical metallization is not in any way impaired.
The textile material metallized by the process described can be used, if desired after increasing the thickness of the metal coat by electroplating, for panel heaters, electromagnetic fields against radio waves, as electrode supports and the like.
DETAILED DESCRIPTION OF THE INVENTION
The invention will be described further in connection with the following specific examples, but it is to be understood that these are merely illustrative in nature and not intended to limit the invention thereto.
EXAMPLE 1
A needled felt web of polyethylene having a nominal thickness of 3.5 mm, a width of 800 mm and a length of 1510 mm, and also a porosity of 92% was impregnated at room temperature with an activating solution which contained 0.5 g of palladium (II) chloride/l, 30 g of tin (II) chloride and 60 g of hydrochloric acid/l (d=1.19).
After removal of the spent activating solution from the pores of the needled felt web by squeezing off between two rolls, the needled felt web was directly dipped into a chemical nickeling solution. The solution contained 24 g/l of nickel (II) chloride and 50 g/l of sodium hypophosphite. Sufficient ammonia was added to this solution to bring it to pH 8-10 at 30°. Nickeling was complete after about 30 minutes. The textile material was freed from spent nickeling solution by squeezing off and by washing with water and was then dried.
As a result of this process, all of the fibers of the needled felt had been uniformly nickeled and therefore could also be electroplated with nickel in an extremely uniform manner. The omission of the customary accelerating and hydrolysis solutions and of the wash steps had no adverse effects whatsoever on the quality of the chemical metallization.
EXAMPLE 2
A fleece material web of polypropylene having a nominal thickness of 4 mm, a width of 400 mm and a length of 25 m, and also a porosity of 95% was activated with a commercially available Pd/Sn-based activating solution. After 20 minutes, excess activating solution was centrifuged off the fleece material web.
The polypropylene web was then coppered at pH 12.5 in a chemical coppering bath containing 50 g of copper sulfate/l, 50 g of sodium potassium tartrate/l, 20 g of sodium hydroxide/l and 100 g of formaldehyde/l. After removal of the spent coppering solution, inspection under the microscope showed no fiber on which copper had not been deposited. Also, in this case, the omission of the washing and rising solutions between activation and chemical metallization had no adverse effects whatsoever on the metallization.
Although the present invention has been described and illustrated in specific examples, it is to be clearly understood that the same is by way of illustration and example only, and is not to be taken by way of limitation. The spirit and scope of the present invention are to be limited only by the terms of the appended claims.

Claims (22)

What is claimed:
1. Process for the chemical metallizing of textile material having pores by activating the textile material by means of an activating solution which contains tin (II) ions and palladium in ionic, colloidal of finely dispersed form and subsequently coating it with metal in a currentless fashion from an alkaline metallizing solution, consisting essentially of:
impregnating the textile material with the activating solution;
pressing out excess activating solution from the pores of the impregnated textile material to provide a textile material still wet with activating solution prior to plating with metal; and
bringing the textile material directly into contact with the metallizing solution without a washing and rinsing operation and coating the textile material with metal.
2. Process as in claim 1, wherein said impregnating includes using textile material in the form of one of fleece material or needled felt which has a fiber linear density of 1.3-3.7 dtex, a porosity of 50% to 97% and a thickness of 1-10 mm.
3. Process as in claim 2, wherein said impregnating includes using textile material in the form of fleece material.
4. Process as in claim 2, wherein said impregnating includes using textile material in the form of needled felt.
5. Process as in claim 1, wherein said impregnating includes using textile material in the form of one of fleece material or needled felt.
6. Process as in claim 5, wherein said impregnating includes using textile material which has a fiber linear density of 1.3-3.7 dtex.
7. Process as in claim 5, wherein said impregnating includes using textile material having a porosity of 50% to 97%.
8. Process as in claim 5, wherein said impregnating includes using textile material having a thickness of 1-10 mm.
9. Process as in claim 1, wherein said coating of the textile material includes coating with one of nickel and copper.
10. Process as in claim 9, wherein said coating of the textile material includes coating with nickel.
11. Process as in claim 9, wherein said coating of the textile material includes coating with copper.
12. Process as in claim 1, wherein said removing of excess activating solution includes centrifuging.
13. Process as in claim 1, wherein said removing of excess activating solution includes mechanical squeezing.
14. Process as in claim 1, wherein said removing of excess activating solution includes using an air current.
15. Process for chemical metallizing of textile material consisting essentially of:
impregnating the textile material with an activating solution;
pressing out excess activating solution from the impregnated textile material to provide textile material still wet with activating solution prior to plating with metal; and
bringing the textile material directly into contact with a metallizing solution without a washing and rinsing operation and coating the textile material metal.
16. Process as in claim 15, wherein said impregnating of the textile material includes using an activating solution which contains tin (II) ions and palladium in one of ionic, colloidal and finely dispersed form.
17. Process as in claim 15, wherein said coating includes coating with metal in a currentless fashion from an alkaline metallizing solution.
18. Process as in claim 15, wherein said impregnating includes using textile material in the form of one of fleece material or needled felt which has a fiber linear density of 1.3-3.7 dtex, a porosity of 50% to 97% and a thickness of 1-10 mm.
19. Process as in claim 15, wherein said coating of the textile material includes coating with one of nickel and copper.
20. Process as in claim 15, wherein said pressing out of excess activating solution includes removing excess activating solution from pores of the textile material.
21. Process for the chemical metallizing of textile material having pores by activating the textile material by means of an activating solution which contains tin (II) ions and palladium in ionic, colloidal or finely dispersed form and subsequently coating it with metal in a currentless fashion from an alkaline metallizing solution, consisting essentially:
impregnating the textile material with the activating solution;
pressing out excess activating solution from the pores of the impregnated textile material to provide a textile material still wet with activating solution; and
immediately bringing the textile material directly into contact with the metallizing solution without a washing and rinsing operation and coating the textile material with metal.
22. Process as in claim 21, wherein said pressing out includes at least one of the following steps, centrifuging, mechanical squeezing and blowing air.
US07/257,120 1986-10-31 1988-10-11 Process for the chemical metallizing of textile material Expired - Lifetime US4925706A (en)

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DE3637130A DE3637130C1 (en) 1986-10-31 1986-10-31 Process for the chemical metallization of textile material
DE3637130 1986-10-31

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DE (1) DE3637130C1 (en)
FR (1) FR2606045B1 (en)
GB (1) GB2196651B (en)
IT (1) IT1211724B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5156899A (en) * 1990-02-10 1992-10-20 Deutsche Automobilgesellschaft Mbh Fiber structure electrode plaque for increased-capacity voltage accumulators
US5595787A (en) * 1989-07-29 1997-01-21 Deutsche Automobilgesellschaft Mbh Chemical metallization of electrically non-conducting porous substrates
WO2020094162A1 (en) 2018-11-06 2020-05-14 Bochemie A.S. Method of continuous metal plating of textile material, device to carry out the method, metal plated textile material and its use
WO2022046749A1 (en) * 2020-08-24 2022-03-03 Noble Biomaterials, Inc. Methods for controlling color during a metallization process and resulting products
US11332830B2 (en) 2017-11-15 2022-05-17 Global Graphene Group, Inc. Functionalized graphene-mediated metallization of polymer article
US11905648B2 (en) 2020-01-28 2024-02-20 Noble Biomaterials, Inc. Metalized fabric that dissipates and scatters infrared light and methods or making and using the same

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DE3637130C1 (en) * 1986-10-31 1987-09-17 Deutsche Automobilgesellsch Process for the chemical metallization of textile material
DE3840200C2 (en) * 1988-11-29 1996-02-08 Heraeus Noblelight Gmbh Process for producing a nonwoven
DE3843903C1 (en) * 1988-12-24 1990-06-28 Deutsche Automobilgesellschaft Mbh, 3000 Hannover, De Activation solution for electrically non-conductive plastic substrate surfaces and process for the preparation thereof and the use thereof
DE3928500A1 (en) * 1989-08-29 1991-03-14 Deutsche Automobilgesellsch METHOD FOR WASHING AND RINSING CHEMICALLY METALLIZED SUBSTRATE RAILS
DE4033518C1 (en) * 1990-10-22 1991-07-25 Deutsche Automobilgesellschaft Mbh, 3300 Braunschweig, De
DE4040017A1 (en) * 1990-12-14 1992-06-17 Deutsche Automobilgesellsch METHOD FOR FILLING FIBER STRUCTURAL ELECTRODE DEVICES PROVIDED WITH CURRENT DISCHARGE DEVICES FOR ACCUMULATORS WITH AN ACTIVE MASS PASTE WITH SIMULTANEOUS CALIBRATION OF THE DEVICE
DE4103546A1 (en) * 1991-02-06 1992-08-13 Deutsche Automobilgesellsch Filling fibrous electrode formers with active paste - using moulding process with the application of isostatic pressure
DE4106696C1 (en) * 1991-03-02 1991-09-19 Deutsche Automobilgesellschaft Mbh, 3300 Braunschweig, De Continuous prodn. of chemically metallised felt or foamed web - involves feeding web to catalytically activated soln. contg. lead and tin, drying, impregnating with metallising soln. etc.
DE4223761C2 (en) * 1992-07-18 1997-05-15 Bauder Paul Gmbh & Co Bitumen roofing membrane
DE4242443C1 (en) * 1992-12-16 1993-06-03 Deutsche Automobilgesellschaft Mbh, 3300 Braunschweig, De Wet chemical metallising process for pre-activated plastic substrates - involves collecting used metallising soln., activating soln. and aq. washings for processing and recycling in the process
DE4444458C1 (en) * 1994-12-14 1995-08-03 Deutsche Automobilgesellsch Metallic artificial substrate made of fleece, needle felt or foam
DE19627413C1 (en) * 1996-07-08 1997-02-27 Deutsche Automobilgesellsch Continuous, uniform metallisation of process materials
DE19711857C2 (en) * 1997-03-21 2003-07-31 Hoppecke Batterie Systeme Gmbh Electrode frame made of needle felt material
DE10005415C1 (en) * 2000-02-08 2001-11-08 Deutsche Automobilgesellsch Ribbon for the fabrication of the grid for electrodes, e.g. for alkaline battery, with a fibrous structure incorporating a lining to improve electrical and mechanical properties of the terminals

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5595787A (en) * 1989-07-29 1997-01-21 Deutsche Automobilgesellschaft Mbh Chemical metallization of electrically non-conducting porous substrates
US5156899A (en) * 1990-02-10 1992-10-20 Deutsche Automobilgesellschaft Mbh Fiber structure electrode plaque for increased-capacity voltage accumulators
US11332830B2 (en) 2017-11-15 2022-05-17 Global Graphene Group, Inc. Functionalized graphene-mediated metallization of polymer article
WO2020094162A1 (en) 2018-11-06 2020-05-14 Bochemie A.S. Method of continuous metal plating of textile material, device to carry out the method, metal plated textile material and its use
US11905648B2 (en) 2020-01-28 2024-02-20 Noble Biomaterials, Inc. Metalized fabric that dissipates and scatters infrared light and methods or making and using the same
WO2022046749A1 (en) * 2020-08-24 2022-03-03 Noble Biomaterials, Inc. Methods for controlling color during a metallization process and resulting products

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FR2606045B1 (en) 1990-06-01
GB8716241D0 (en) 1987-08-19
GB2196651A (en) 1988-05-05
GB2196651B (en) 1991-03-27
IT8748308A0 (en) 1987-08-18
IT1211724B (en) 1989-11-03
FR2606045A1 (en) 1988-05-06
DE3637130C1 (en) 1987-09-17

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